Improvement in mortar-mixers



C. PIERCE.

Mortar-Mixers. I N0. 141,947. Pat entedAugust19,1873.

.Tvn as: 2

NITED CHARLES PIERCE, OF PORTLAND, MICHIGAN, ASSIGNOR TO HIMSELF AND ALMERON PIERCE, OF SAME PLACE.

IMPROVEMENT IN MORTAR-MIXE RS.

Specification forming part of Letters Patent No. l lLQ lZ', dated August 19, 1873; application filed May 8, 1873.

To all whom it may concern:

Be it known that 1, CHARLES Irnnon, of Portland, in the county of Ionia and State of Michigan, have invented a new and useful Improvement in a Mortar-MixingMachine; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, and being a part of this specification, in which Figure 1 is a perspective view of the machine, showing the slaking-cylinder in position at the top, a part of the mixing-trough being broken away to show the beaters, the limescreen being also placed across one end of said trough. Fig. 2 is an elevation of the rear side of the machine, showing a longitudinal sectionof the trough, but with the lime-screen and slaking-cylinder removed, and the latter replaced by the revolving sand-screen. Fig. 3 is a cross-section of the machine on the line a: .00, Fig. 2, showing the lower part of the trough, discharge-spout, and grinding-wheel.

Like letters refer to like parts in the several figures.

The nature of this invention relates to a machine for mixing and grinding mortar, wherein the several operations of slaking the lime, mixing therewith the hair and sand, and screening the latter, and of finally grinding the mixed mortar as it is delivered, are performed with economy of time and ilabor, and insuring a mortar of uniform quality and temper. The invention consists in the novel and peculiar construction and arrangement, with relation to a mixing-trough wherein a beater-shaft revolves, of a slaking-cylinder, a revolving sandscreen, and a discharge-spout with a concave at its lower end, in which revolves a peculiarlyconstructedgrinding-wheel; also, in so ar-a ranging the discharge-spout that itwill recede from the wheel in case a stone or other obstruction should lodge between it and the wheel, and allow the obstruction to pass out without damage to the trough, the whole being arranged to operate as more fully hereinafter set forth.

In the drawing, A represents the frame of my machine, between whose corner-posts is secured a deep mixing-trough, B, having a semicylindrical bottom. 0 is the mixingshaft, journaled through the ends of the box; is driven by a belt from any source of power passing around one of the cones of its speedpulley D at its end in the direction of the arrow. The shaft is armed with a spiral row of beaters, E, inserted at an angle with the axis of said shaft,to move the contents toward the end which carries the pulley, the beaters passing between a series of bars, a, pendent from a beam, F, extending from end to end of the trough directly over the shaft. In the bottom of the trough, near the pulley end, is an opening, which may be closed at will by a sliding gate, 1). This opening leads into the top of a spout, G, which has its lower end enlarged to form a semicircular concavity, across the axis of which a shaft, H, is journaled in the sides of the trough, carrying a pulley, I, on its outer end, which is driven by a belt from one of the faces of the cone D above. Between the sides of the trough a heavy wooden wheel, K, is mounted on the shaft H, its perimeter being faced with cast-iron segments or shoes 0, which revolve with the wheel almost in contact with the iron concave of the spout, so that the mixed mortar, as it passes down the spout, will be ground to uniform fineness before its final discharge at the extremity of the concave. The upper end of the spout is hinged at d to the bottom of the trough,

.and under its lower end is a spring, 6, interposed between'itiand the grinding-wheel, to keep it up to the latter, except when a small stone or other hard substance should accidentally get into the spout, in which case the spring will allow the spout to yield from the wheel until the obstruction has passed out. L is a watertight metal cylinder mounted on a shaft, M, journaled in open bearings in the top of the frame, with a pulley, N, at one end, which a belt from the cone-pulley below passes around to revolve the cylinder, which has a tight door, 1', near the farther end, through which quicklime and the proper amount of water may be introduced, when the slaking of the lime proceeds during the revolution of the cylinder. When the lime has been slaked it may be dumped into the trough by opening the door 1', but should be passed through a coarse screen, 0, placed under the cylinder to catch any undissolved lumps, pebbles, &c. The lime-cylinder is now removed from the bearings and replaced by a revolving sandscreen, 1?, mounted on a shaft, Q, provided with a pulley, It, driven by a belt from the cone below. The screen is open at the ends, and has an Archimedean screw, f, affixed to its interior surface to convey the sand shoveled in at the back end toward the front. The sand sifts through, falling into the trough, while the stones, &c., are discharged into a a spout, g, under the front end. Before adding the sand, the proper quantity of hair should be placed in the trough to be thoroughly incorporated by the beaters with the slaked lime. The pendent bars a free the beaters from the hair which they take up in their rotation. The sand being gradually added, the mortar is thoroughly tempered by the action of the beaters, when it is drawn off from the trough by opening the gate binto the spout, passing under the grinding-wheel before its final delivery.

In this manner a large amount of uniformlytempered and finely-ground mortar may be furnished with a great saving of time, labor,

scribed.

OHARLES PIERCE. Witnesses:

H. S. SPRAGUE, H. F. EBERTS. 

